Temperature-control device



' April 2, 1929. E. K. CLARK TEMPERATURE CONTROL DEVICE Filed Dec. 1926 2 Sheets-Sheet l Fly. 2.

INVENTOR WITNESSES:

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Ap1jil 2, 1929. E. K. CLARK V I 1,707,253

TEMPERATURE CONTROL DEVICE Filed Dec. 8. 1926 2 Sheets-Sheet 2 so a 53 5a 6o fiyiJ. T

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- 4- I BY Patented Apr. 2, 1929.

UNITED STATES i OFFICE.

nAnL K. icmnx, 1 MANSFIELD, 0:110; Asslenon o wnsrmenousn nnncrmc & MANUFACTURING COMPANY, VA oonronnr on or PENNSYLVANIA.

TEMPEBATURE CONTROL DEVICE.

Application filed EDeeember 8, (1926. Serial No. '1-53;26l 3.

My invention relates to control devices], and particularly to tliiernia lily Lend mechanically actuated instruments.

An objector my invention is to provide at temperature control instrument that shell have at plurality of contact members (301k trolled selectively and intermittently "by in coins of a therniml responsive [device end at periodicollly-controlled clumping member.

Another object of my inven ion is to :proride a telnperztture-control in trulnent that shall. have moons responsime qdilneetly lllO the temperature of a body to he controlled tor selectively en hgingo ne :of it pllllllfilllllly 01" COHi'iLOlJ menibeil 12nd thztt shnlil have a .periodicell controlled clamping member dior citiccting selectiveengagement of the contact inenrber with e stationery con'tee1t.

In preetieing my invention. l[ provide la ill-1811110TGSP011S1V8 means i-n the term o l e met ellic spir e1 that; is ad zvpte d to be :1 snblj cote d to the teinperaltureof-e body to be controlled. A pivotelly mounted pointer :is adjustzvbily secured to the therlno-responsive IIlElGtllIlS and is adopted to be periodically clumped into engagement with one of e p hrrwlity oil? contact members by moons of 21 nmgnet :coil nod en. Ell'll'lllklllfi) controlled thereby.

In the clrmvings,

30 Fig. 1 is a top plan view in elevation, spilltiirlly in section, of a device embodying my invention i Fig. 2 is a side View inelexmtlon, lpurtiailly in section, of thede-vice illustrated inFig. 1

Fig. 3 a, View thereof, in uortieall'section, taken on the line II'I II'I of Fig. 2:; and

Fig. l: is a diagrammatic View of the device illustrated in Figs. 1 and 2, as supplied to the control of an electrically heated device.

In the drawings, a temperature control device l1 comprises a magnetically controlled clzm'lping mechanism M2, n plurall rty of lTlOV- able contacts 13 and 1d controlled thereby, a movable pointer 15 end e thermalwcspon site means 16 for actuating the pointer 15.

The n1agnetieeily-controlled clamping meth enisln comprises o baee 17,3 magnet coil leinou-nted thereon, ttI-ltl en external meg-- ueliic path 19 therefor. Que terminal 20 of the magnet coil is secured to the base 17 The external magnetic path M) eoinprises a stationary member 21 end an lei-mature 22 supported thereby. The stationary member 21 comprises e portion "23 that extends upward-1y at on edge 24c ME the base if? The portion 23 is provided with a projection or pm portion -25 located et the end thereof and a bolt 26 which extends laterally therefrom. A portion 27 of the member :2l entends elong the-hottomedge of the base L7; and a portion 28 thereozf extends substantially at right ongles thereto and projects through on aperture 29 in the base 17.

ThGqCOid Th8 and the tstzttionzn y member 21 are secured to the hese 157 by means of 2L bolt that extends lthlzough the coil 18, the base 1?? and the portion 2'7 of the member 21. The want-mittens 2 2 is of substantially shape .end comprises a pair of depending portions 32, 3-3 :and e connecting ,portion 84. The portion 34 is provided with a circular aperture 35 and the pontion 32 :is pll 'ovided some by means of nuts 39.

A mel-nber 41, of. substantially U-shepe, extends across the base :17 along the edge end is suitably secured there a. The member 41 .pnowided with a painiof upwertlly extendiingend portions 42 land it. The portion 2 5 asp 'tion l ld benlt ouernt substztnt ly in t angles thereto and supports a :n esih angle ,piece 4E5 that is suitably secured thereto.

A cllmnping member 46 pivot lly suppolited by the zportioigis 42 hand 43 of the member 4:1 and comprises e portion l7 end a pair of end portions l8 and t9 extending substmt to has its end so ibent thatit meg stem with en npeeture in the portion loo-f the member 41. ll he portion 458 is provided with an end .pontlon 51 :of substantially U-shepe which protrudes through on aperture 52 in the portion 42 and registers with the angle lpieeefi. Theuanglepiece deserves to bias the aniielnber 46 towards the position substantially lessillustretetl in Figsfinntl 310i the drawings. When the lCOlil l8 lislener ized, the member tia lly .zi-t right angles thereto. gllhc portion 46 is clamped into engagement with the pointer by means of the armature 3 1 and the angle piece 37 secured thereto.

The contacts 13 and 1 1 are suitably seeiu'ed I to a pair of resilient spring members 53 and 54:, of substantially U-shape, that .are secured to the bottom surface 15 of the base 17 by any suitable means, such as machine screws. A

" I cooperating stationary contact 55 for the'c ontacts 13 and 14,1is suitably. secured to the base 17. A spacing member 56 is secured tothe base 17 andserves to prevent the pointer 15 taneously.

secured to'the base 17 at the undersidetherefrom engagingthe contacts 13 and 14 simul- A pair of angle pieces 57 (see Fig.3) are of by suitable bolts-58 and extend upwardly therefrom. End portions 59 of the members x 57 are provided with bolts 60.

A cover member'61 serves to enclose the magneticallycontrolled clamping mechanism 12 and is supported by and secured to the members 57 by a pair'of nuts 62,-only one of which is shown,- (see Fig. 2), thathave screwthreaded engagement with the bolts 60.

The base '17 is suitably secured to a longitudinally extending member 63 by such means as machine screws or rivets.

The pointer 15 issecured to a pivotally mounted member 6 1 by rivets65 that extend a through the meinber64 and register with a return bent portion 66 of the pointer 15. A

, pivot 67 is securedto substantially the central portion of the member 64 and is supported between bearings 68 and 69. The bearing 68 is secured to the member 63 and the bearing 69 is secured to a member 7 O of substantially U-shape, which in turn, is secured to the member 63 by such means as rivets 71. A portion 72-of the bearing 68 "projects through the member 63 for a purpose to be hereinafter explained. A resilient spring 74 is secured to i. stantially at right angles "to the member63 and is provided with a tail piece 82 that is bent at-a-n angle tothe portion 81. A bolt 83 ex:

' tends through the portion 82 and serves to 1 clamp the device 11 into engagement with the body whosetemperature is to be controlled.

Th'eth ermal-responsive means 16 comprises a metallic spiral 84, one end of which is socured to a rod 85; and the other end to a mem- 'ber 86 of substantially L-shape. If so desired the spiral 841 may be made of suitable bimetal- 1 lie material. The rod extends upwardly through the aperture 87 in a portion 88 of the member 86 and has a disc 89 secured to the end thereof. A plurality of pins 90 are disposed along the periphery of the disc 89 and are adapted to fit between the spring 74k and the portion 75 of the member 64. The pins 90 may be utilized for determining the initial angular position of the pointer 15 with respect to the member 63, which position determines the temperature setting of the relay.

The member 86 is secured to the member 76 by means of a rivet.

The member 63 is secured to the clamping member 76 by means of screws 91. The screws 91 extend through arcuate apertures located in the member 63 and have screw-threaded engagement with the member 76 (see Figs. 1 and 2).

The portion 72 of the bearing 68 projects through the members 63 and 76, thus providing a pivot about which the member 63 may be turned. By loosening the screws 91., the member 63 may be positioned at any desired angle, either to the right or the left, lOlFtl'lVQlV to the position illustrated in Fig. 1, in which position it may be clamped firmly by the screws 91.

By reason of the fact that the member 63 and the pointer 15 may be positioned in any desired angular position, either to the right or the left of their positions as illustrated in Fig. 1, the initial temperature setting or adjustment of the relay 11 may be so controlled that it can be adapted to operate over a wide range of temperatures.

When the metallic spiral 8 1 is subjected to the temperature of a body to be controlled, it expands upon increasing temperature to turn the disc 89, thereby imparting motion to the pointer 15.

In Fig. 4: of the drawing, I have illustrated the temperature control device 11 as a means for controlling the temperature of a body 92. The magnet coil 18 is intermittently energized by a. rotating commutator 3, which .may be driven by a motor 94, suitable for the purpose. hen the segments 95 of the com mutator 93 make contact with the brushes 96, the coil 18 is energized from a source of electromotive force 97 to actuate the :irimiture 34a downwardly thereby clan'iping the pointer 15 into engagement with one or the other 0 l the contact members 13 and 14.

When the pointer 15 is in the position illus trated in Fig. 4- of the drawings, the armat Hl'o 34a. when attracted by the coil 18, clamps the contact member 14- into engagement with the stationary contact member 55, causing a coil 99 to be energized from a source oF electromotive force 100. The coil 99, when encrgized, actuate a switch mechanism 101 which. in turn, causes a resistor 102 to be encrgizei'l from a source of electromotive force 103 for heating the body 92.

When the temperature of the body 92 has increased to a predetermined value, the pointor 15 will have been actuated to such a position that the contact member 13 engages the contact 55. A magnet coil 10% is then energized Which, in turn, so actuates the switch mechanism 101 that the resistor 102 is deener ized. If the temperature falls below a predetermined value, the pointer 15 is actuated substantially to the position illustrated in Fig. l of the drawings. It, When in this position, the contact member 14; is moved into eneagei'uent with the contact member 55 by means oi: the coil 18 and the armature 84o, the coil 99 is energized to actuate the switch 101., which, in turn, energizes the resistor 102.

lily my invent-ioml have provided a sensitive temperature-control device that simple in constructi m and rugged. The device comprises a movable pointer that is actuated by metallic spiral which may be directly subjected to relatively high temperatures, and an intermittently controlled clan'iping inechanism for clamping the pointer into enar genient with one of a plurality of contact members.

Various modifications may be made in the device embodying my invention Without departing from the spirit and scope thereof, I desire, therefore, that only such limitations shall be placed thereon as are imposed by the prior art and the appended claims.

I claim as my invention:

1. In a temperature control instrument, the combination with a thermo-responsive metallie member of spiratshape, a stationary con tact member, a plurality of movable contact members, and a pivotally mounted member. for selectively actuating one of said plurality of contact members into engagen'ient with said stationary contact member, of means controlled by said thermo-responsive member l'or actuating and for controllingthe initial position of said pivotally mounted member, said means comprising a disc member and a plurality of spaced pin members disposed along the periphery thereof for registering with one end oi said pivotally mounted member.

2. A temperature control instrument com-- prising a metallic member of spiral-shape, a support therefor, a rotatable member operatively secured to one end of said metallic member, a disc member op- ?atively associated With the rotatable member, said disc member having a plurality of pin members disposed along its periphery, a pivotally mounted member having; one end thereof in selective ongagennmt with said pin members, a movable contact member, and an electroumgnetically controlled member for periodically clamping the pivotally mounted member into engagement with said movable contact member.

3. it. thermal. relay comprising a thermoresponsive metallic spiral, a disc member having a plurality oil pin members disposed along the periphery thereof, said disc men'ibcr being controlled by the spiral in accordance with the temperature thereof, a pivotally mounted member for controlling a movable contact mcn'iber, said. pivotally mounted member having one end thereof in engagement with one oi? said pin members, a contact member, and magnetically controlled means for periodically clamping the pivotally mounted member into engagement with said contact member.

l. A timiperature control (lOVlQO compris ingplurality of movable contact members and a cooperating); stationary contact member, means for selectively controlling; said a thermal condition to be controlled, a metal.- lic spiral member adapted to be subjected to the thermal condition for actuating said means, and means associated. with the spiral. for biasing: the first-named means toa pre detcrmin-zul initial position.

ln a temperature-control device, in combination, a support, a tliernio-rcspoi'isive ntiember mounted thereon, a eontact-supportii ,1 member carried by said support, a pointer p volally mounted on said contae'tsupportingr n'iembor 'l'or actuating; the contact members, and means for varying; the angular relation o'l' the support to the contact-sopporting member.

in testimony Wherm t, l. have hereunto subscribed my name this 6th day of December,

EARL K. CLARK. 

